IEC 60404-2:1996
(Main)Magnetic materials - Part 2: Methods of measurement of the magneticproperties of electrical steel sheet and strip by means of anEpstein frame
Magnetic materials - Part 2: Methods of measurement of the magneticproperties of electrical steel sheet and strip by means of anEpstein frame
Applies to grain oriented and non-oriented electrical sheet and strip for a.c. measurements of magnetic properities at frequencies up to 400 Hz and for d.c. magnetic measurements. Defines the general principles and the technical details of the measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame. The a.c. magnetic characteristics are determined for sinusoidal induced voltages, for specified peak values of magnetic polarization and for a specified frequency.
Matériaux magnétiques - Partie 2: Méthodes de mesure des propriétésmagnétiques des tôles et bandes magnétiques au moyen d'un cadreEpstein
S'applique aux tôles et bandes magnétiques à grains orientés et non orientés, pour le mesurage des propriétés magnétiques en courant alternatif jusqu'à la fréquence de 400 Hz, et pour les mesures magnétiques en courant continu. Définit les principes généraux et les détails techniques du mesurage des propriétés magnétiques des tôles et bandes magnétiques au moyen d'un cadre Epstein. Les caractéristiques magnétiques en courant alternatif sont déterminées pour des tensions induites sinusoïdales, pour des valeurs crêtes particulières de la polarisation magnétique et pour une fréquence spécifiée.
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IEC 60404-2 ®
Edition 3.1 2008-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 2: Methods of measurement of the magnetic properties of electrical steel
strip and sheet by means of an Epstein frame
Matériaux magnétiques –
Partie 2: Méthodes de mesure des propriétés magnétiques des bandes et tôles
magnétiques en acier au moyen d'un cadre Epstein
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IEC 60404-2 ®
Edition 3.1 2008-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 2: Methods of measurement of the magnetic properties of electrical steel
strip and sheet by means of an Epstein frame
Matériaux magnétiques –
Partie 2: Méthodes de mesure des propriétés magnétiques des bandes et tôles
magnétiques en acier au moyen d'un cadre Epstein
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 29.030 ISBN 2-8318-9835-8
− 2 − 60404-2 © IEC:1996+A1:2008
CONTENTS
FOREWORD.4
1 Scope and object .6
2 Normative references.6
3 General principles of a.c. measurements .7
3.1 Principle of the 25 cm Epstein frame method .7
3.2 Test specimen .7
3.3 The 25 cm Epstein frame.7
3.4 Air flux compensation .9
3.5 Power supply.9
3.6 Voltage measurement.9
3.7 Frequency measurement .10
3.8 Power measurement.10
4 Procedure for the measurement of the specific total loss.10
4.1 Preparation for measurement.10
4.2 Adjustment of power supply .10
4.3 Measurement of power .11
4.4 Determination of the specific total loss .11
4.5 Reproducibility of the specific total loss measurement.12
5 Procedure for the determination of the peak value of magnetic polarization, r.m.s.
value of magnetic field strength, peak value of magnetic field strength
and specific apparent power .12
5.1 Test specimen .12
5.2 Principle of measurement .12
5.3 Reproducibility.14
6 General principles of d.c. measurements .14
6.1 Principle of the 25 cm Epstein frame method .14
6.2 Test specimen .14
6.3 The 25 cm Epstein frame.14
6.4 Air flux compensation .15
6.5 Power supply.15
6.6 Apparatus accuracy .15
7 Procedure for the d.c. measurement of the magnetic polarization .15
7.1 Preparation for measurement.15
7.2 Determination of the magnetic polarization.15
7.3 Determination of the magnetic hysteresis loop .16
7.4 Reproducibility of the measurement of the magnetic polarization .16
8 Test report.16
Annex A (informative) Digital sampling methods for the determination of the magnetic
properties .21
Bibliography .24
60404-2 © IEC:1996+A1:2008 − 3 −
Figure 1 – Double-lapped joints .17
Figure 2 – The 25 cm Epstein frame.17
Figure 3 – Circuit for the wattmeter method .18
Figure 4 – Circuit for measuring the r.m.s. value of the magnetizing current.18
Figure 5 – Circuit for measuring the peak value of the magnetic field strength
using a peak voltmeter .19
Figure 6 – Circuit for measuring the peak value of magnetic field strength
using a mutual inductor M .19
D
Figure 7 – Circuit for d.c. testing: to obtain discrete values of magnetic polarization.20
Figure 8 – Circuit for d.c. testing: continuous recording method .20
− 4 − 60404-2 © IEC:1996+A1:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 2: Methods of measurement of the magnetic properties
of electrical steel strip and sheet by means of an Epstein frame
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